Prediction of Dynamics of Bellows in Exhaust System of Vehicle Using Equivalent Beam Modeling

등가 보 모델링 방법을 이용한 차량 배기계의 벨로우즈 동특성 예측

  • Hong, Jin Ho (Noise & vibration CAE Team, Hyundai Motor Company) ;
  • Kim, Yong Dae (Noise & vibration CAE Team, Hyundai Motor Company) ;
  • Lee, Nam Young (Noise & vibration CAE Team, Hyundai Motor Company) ;
  • Lee, Sang Woo (Noise & vibration CAE Team, Hyundai Motor Company)
  • 홍진호 (현대자동차 진동소음해석팀) ;
  • 김용대 (현대자동차 진동소음해석팀) ;
  • 이남영 (현대자동차 진동소음해석팀) ;
  • 이상우 (현대자동차 진동소음해석팀)
  • Received : 2015.02.25
  • Accepted : 2015.08.11
  • Published : 2015.11.01


The exhaust system is one of the major sources of vibrations, along with the suspension system and engine. When the exhaust system is connected directly to the engine, it transfers vibrations to the vehicle body through the body mounts. Therefore, in order to reduce the vibrations transmitted from the exhaust system, the vibration characteristics of the exhaust system should be predicted. Thus, the dynamic characteristics of the bellows, which form a key component of the exhaust system, must be modeled accurately. However, it is difficult to model the bellows because of the complicated geometry. Though the equivalent beam modeling technique has been applied in the design stage, it is not sufficiently accurate in the case of the bellows which have complicated geometries. In this paper, we present an improved technique for modeling the bellows in a vehicle. The accuracy of the modeling method is verified by comparison with the experimental results.


Bellows;Equivalent beam;Finite element analysis


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